How Long Do ADU Permits Take?

The question every homeowner asks, answered honestly: typically 2 to 4 months from submission to permit in hand — with a best case near 6–8 weeks and a slow case stretching past 6 months. What separates them is mostly identifiable and controllable. Let's decompose.

Where the calendar actually goes (assembling this module):

• Completeness check: up to 15 business days (usually less)
• First plan check round: 3–8 weeks depending on city workload (bounded by the 60-day clock)
• Correction response: your team's speed — 1 week to 2 months (the swing variable, as lessons 10.1–10.4 kept insisting)
• Recheck round(s): 2–4 weeks each
• RTI logistics: days if you're ready, weeks if you're not

The compression levers, ranked by power:

1. Submit a complete, coordinated set. Fewer corrections, fewer rounds — the entire lesson of Module 9. This is the biggest lever and it's pulled before day one.
2. Respond to corrections in days, not months. Choose a team whose permit-response speed you've asked about directly (Module 11 gives you the script).
3. Use pre-approved plans where they fit. Cities must offer pre-approved ADU plan programs, and review of those can run ~30 days (Module 13.10 covers when they're right for you).
4. Run parallel processes. Utility applications, HOA review, contractor selection — all during plan check, not after (lessons 10.6, 10.8).
5. Know your city's rhythm. Cities differ in workload and process (sequential vs. parallel review, portal quality, recheck speed). A team with recent experience in your city forecasts honestly and prevents the classic local snags.

What doesn't help: calling the city weekly for status (the clock is the clock), submitting early with an incomplete set "to get in line" (it bounces at completeness and you've gained nothing), or treating the slow case as inevitable (it's almost always the sum of slow responses, not city malice).

Set expectations, then relax: permit time is real but bounded, and it's the phase where your money isn't burning — use it to finalize contractor selection (Module 11) and construction planning (Module 12) so the day the permit issues, shovels are already scheduled.